Two NYPD cops saved an unconscious little girl Saturday afternoon after she stopped breathing and turned blue on the Upper East Side, the department said.

The 15-month-old's belch brought tears of joy to her parents and the officers, one performing rescue breathing, as they rushed the toddler to the hospital.

"That young child let out a belch and that was the greatest sound that I ever heard," said Officer Michael Konatsotis, 45.

Behind the wheel was Officer David Roussine, 25. He's been with the NYPD for about a year and a half, and Konatsotis for 17 years.

Both officers, who are assigned to the 30th precinct but were patrolling the 19th Saturday, live in Queens.

"We were all just crying -- a 45-year-old and a young guy, bawling, crying," Konatsotis said. "It was joyful."

The episode unfolded Saturday around 2 p.m. when an police radio call sent the partners to 207 E. 74th St., between 2nd and 3rd avenues. As Konatsotis and Roussine pulled up, they saw the frantic parents.

"Looking at that beautiful baby that needed dire help, Dave and I knew that our training as police officers, as fathers and as New Yorkers -- and now also as humans -- we had to do something, and we did," Konatsotis said.